What Is SA 516 Gr.60 NACE + HIC Plate?
SA 516 Gr.60 serves as a carbon steel plate grade built for pressure vessel construction, valued for its combination of moderate strength and dependable toughness. SA 516 Gr.60 NACE + HIC Plate refers to this same base grade produced and tested to meet additional requirements for sour-service environments, where hydrogen sulfide exposure creates a risk of hydrogen-induced cracking. Refineries and gas processing units cannot rely on standard-grade plate once H2S is present. SA 516 Gr.60 NACE + HIC Plate are supplied to buyers working on vessels and equipment destined for these conditions, and full specifications are available on the SA 516 Gr.60 NACE + HIC Plate product page.
Key Properties of SA 516 Gr.60 NACE + HIC Plate
Pressure-vessel steel needs to behave predictably under sustained internal pressure, and SA 516 Gr.60 delivers that through a controlled carbon-manganese composition. Toughness matters just as much as strength here. The grade retains acceptable impact resistance at lower service temperatures, which is why it appears so often in vessels operating outside warm, stable climates. Weldability stays strong across standard fabrication methods, including submerged arc and manual metal arc welding, provided preheat and interpass temperature controls follow the fabricator’s welding procedure. Where the NACE HIC steel plate designation applies, the plate undergoes additional processing and testing aimed at reducing susceptibility to hydrogen-induced cracking, but this resistance is only established when the specific heat and test lot have been verified against the applicable acceptance criteria. Low-temperature toughness, weld integrity, and cracking resistance work together, not in isolation, when a vessel sees years of sour-service duty.
What Do NACE and HIC Requirements Mean?
NACE Requirements
NACE standards address material behavior in environments containing hydrogen sulfide. The plate is NACE compliant only if the material requirements, testing protocol and specification for the specific project prove it.
HIC Testing
Hydrogen-induced cracking develops when atomic hydrogen collects inside steel and forms internal blisters or cracks. HIC testing evaluates a plate’s resistance under these conditions, though passing the test does not make any plate permanently immune to hydrogen damage.
Applications of SA 516 Gr.60 NACE + HIC Plate
- Pressure vessels: Vessels holding sour hydrocarbons need plate that resists both internal pressure loads and hydrogen attack over years of service.
- Oil and gas processing equipment: Separators, scrubbers, and knockout drums handling H2S-bearing streams depend on HIC-tested material to avoid premature cracking.
- Petrochemical equipment: Process units exposed to sour feedstocks use this plate where standard carbon steel would degrade faster.
- Storage vessels: Tanks holding sour crude or sour water require the same cracking resistance as process equipment.
- Sour-service equipment: Any component in continuous contact with H2S-contaminated media falls into this category by definition.
- Refineries and related process facilities: Rexton identifies pressure vessels, chemical industries, oil and gas, power generation, and low- and medium-temperature pressure-vessel applications as the primary demand areas for this plate.
How to Select SA 516 Gr.60 NACE + HIC Plate
- Start by identifying the actual service environment the vessel or component will face. Not every project needs sour-service protection.
- Confirm whether the process stream contains hydrogen sulfide at concentrations that trigger sour-service design requirements under the relevant project specification or NACE document, since this determines whether SA 516 Gr 60 NACE Plate or standard-grade material applies.
- Once sour service is confirmed, establish which HIC testing regime the project calls for, along with acceptance criteria for crack length ratio, crack thickness ratio, and crack sensitivity ratio.
- Plate thickness and dimensions come next, matched against the vessel design calculations rather than assumed from a catalog default.
- Low temperature service may require that impact test temperature be below the minimum specified in the governing specification and shall be independently verified for mechanical properties.
- Welding and fabrication requirements deserve equal attention. Sour-service welds often require hardness testing and controlled heat input to avoid creating hard zones that become crack initiation sites.
Finally, verify inspection reports and material documentation before the plate ships, because paperwork gaps discovered after fabrication begins cost far more than a delayed order. Buyers sourcing ASME SA 516 Gr 60 NACE HIC Plate or ASTM A516 Grade 60 NACE HIC Plate should treat this sequence as a checklist, not a formality.
What Documentation Should Be Verified?
The plate should be accompanied by a material test certificate showing heat number, chemical analysis and mechanical test results traceable to the lot supplied. Confirm the applicable material standard referenced on the certificate matches the project specification exactly, since minor edition or supplementary requirement mismatches create compliance gaps later. Where NACE compliance applies, request the specific documentation showing which NACE standard was used and what acceptance criteria governed the test. A HIC test report should show the crack ratios recorded for the tested samples, not just a pass or fail statement. Chemical analysis and mechanical test results need to be reviewed against both the base specification and any project-specific supplementary requirements. Third-party inspection documentation applies only when the purchase order specifies it, so confirm this requirement before assuming an inspection report will be included. Not every order carries every certificate type by default, which makes clarifying documentation needs at the inquiry stage a necessary step rather than an afterthought.
Contact Rexton Steel and Alloys to confirm current stock and documentation available for your SA 516 Gr.60 NACE + HIC Plate requirement.
